EP1127642B1 - Power lever chuck - Google Patents

Description

The invention relates to a power-operated lever chuck with designed as levers clamping arms, each in one Guide receptacle in the chuck body axially displaceable guided and by a storage in a chuck body trained ball seat around a string of the Cross section through the chuck body corresponding Swivel axis are adjustable (see, for example, US 5,605,343).

In such known from practice lever chuck it has proved to be problematic, the guide shots as well as the ball seat with the necessary accuracy relative to each other, since the in the Chuck body trained guide shots only difficult and consuming to work around in these plane surfaces to produce half their distance exactly on the Center of the ball seat shows and their parallel Arrangement not be twisted relative to the ball seat may. The necessary, by means of eroding Machining the chuck body must be done with great care done so by a wrong processing step not the entire chuck body becomes unusable.

The invention is therefore based on the object Lever of the type mentioned in such a way that in the chuck body the relative orientation of the Ball seats and the axial guide surfaces of the clamping arms can be realized more easily.

This task is with a lever chuck of the beginning mentioned type solved in that in the guide receptacle one of the lateral support of the clamping arm serving Tuning plate is releasably attached.

The invention offers the advantage that in a simple manner placed the tuning plate in the chuck body and there It is possible to measure which processing is required is to achieve the desired exact alignment with the To reach the ball seat. The editing itself can then when removed from the chuck body again Tuning plate can be made in isolation, the easier to handle and their working surfaces easier are accessible. The risk of incorrect processing only affects the low-cost tuning plate and not the chuck body of the lever chuck as a whole.

A preferred embodiment of the invention is characterized characterized in that the tuning plate provided twice and the two tuning plates on both sides of the clamping arm are arranged, as such a shift in the two perpendicular to the guide surfaces lying directions is possible.

It has proved to be useful if the Tuning plate in one in the guide holder arranged plate pocket and there through laterally the chuck body passing through securing members this is particularly true with regard to easy mounting option of tuning plates as well their reproducible positioning in the Guide shots is cheap.

Fig. 1

die Vorderansicht eines erfindungsgemäßen Hebelfutters mit drei gleichmäßig über den Umfang verteilt angeordneten Spannarmen,

Fig. 2

einen Axialschnitt durch das Hebelfutter mit dem Spannarm in einer axial vorgeschobenen Position,

Fig. 3

eine der Fig. 2 entsprechende Darstellung mit einer axial zurückgezogenen Position des Spannarms,

Fig. 4

den Schnitt IV-IV aus Fig. 3, und

Fig. 5

den Schnitt V-V aus Fig. 4.

In the following the invention will be explained in more detail in an embodiment shown in the drawing; show it:

Fig. 1

the front view of a lever chuck according to the invention with three clamping arms distributed uniformly over the circumference,

Fig. 2

an axial section through the lever chuck with the clamping arm in an axially advanced position,

Fig. 3

2 corresponding representation with an axially retracted position of the clamping arm,

Fig. 4

the section IV-IV of Fig. 3, and

Fig. 5

the section VV of Fig. 4th

Fig. 1 shows the end face of a power-operated Lever 1, the three evenly around the circumference distributed arranged clamping arms 2, where by means of fastening screws 3 which the clamping surfaces. 4 having clamping inserts 5 are attached. With 6 is denotes a centering plate. The clamping arms 2 are as Lever formed and in the chuck body 7 to a Swivel axis 8 adjustable, the - in a cross section seen through the lever chuck 1 - on a chord of the round chuck body 7 is located.

The axial adjustment of the clamping arms 2 by means of an axially adjustable clamping rod 9, so that the Clamping arms 2 between that shown in FIG. 2 and the be moved in the axial position shown in Fig. 3 can. The pivoting of the clamping arms 2 is characterized by a Wedge surface 10 causes the same by means of a Piston 11 can be moved axially and with the Clamping inserts 5 opposite axial ends of the clamping arms. 2 interacts. To a precise pivoting around the To reach pivot axis 8, the clamping arms 2 are in one Ball seat 12 stored. This ball seat 12 must now be precise opposite the guide surfaces 13 for the axial Adjustment of the clamping arms 2 to be aligned. To this, too reach are in a guide receptacle 14 for the Tension arms 2 plate pockets 15 are formed in the on both sides of the clamping arm 2 tuning plates 16 used and can be releasably secured, for which the side Chuck body 7 passing through securing members 17, namely Securing screws are provided. With that as a reference given ball seat 12 can now the required Plate thickness determined and the editing of the Tuning plates 16 after removing them from the Chuck body 7 done, this being due to the detachable Attachment is also possible in iterative steps each in the meantime a survey of the in Plate pockets 15 inserted tuning plates 16 takes place.

Claims (3)

1. A power-operated lever chuck with clamping arms (2) which are in the form of levers and which are each axially slidably guided in a respective guide receiving means (14) in the chuck body (7) and which are displaceable by a mounting in a ball seat (12) in the chuck body (7) about a pivot axis (8) corresponding to a chord of the cross-section through the chuck body (7), characterised in that an adaptor plate (16) serving for lateral support of the clamping arm (2) is releasably fixed in the guide receiving means (14).
2. A lever chuck according to claim 1 characterised in that the adaptor plate (16) is provided in duplicate and the two adaptor plates (16) are arranged on both sides of the clamping arm (2).
3. A lever chuck according to claim 1 or claim 2 characterised in that the adaptor plate (16) is arranged in a plate pocket (15) provided in the guide receiving means (14) and is secured there by securing members (17) passing laterally through the chuck body (7).

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